I don’t think so. It looks like conglomerate rock that has been polished.
Looks close to being an agetized Dino bone.
2.1" Polished Agatized Dinosaur Bone - Colorado
2.1" Polished Agatized Dinosaur Bone - Colorado (Item #38342), Polished Dinosaur Bone for sale. FossilEra your source to quality fossil specimens.www.fossilera.com
Well there are quite a few online stores selling these agatized specimens. Maybe send pictures to a couple and get their opinion if they're willing to offer one.Interesting, cuz as a kid i was told it was a dino fossil. I didnt say that before cuz i was so sure it wasnt. kids will believe anything. How can i be sure?